To prevent leakage and theft of information, by simple and safe constitution.
A casing 2 of this information device 1 is formed into double structure, and is provided with an inner casing 20 sealed to bring its inside into the first atmospheric pressure, an outer casing 10 including the inner casing 20 in its inside and sealed to bring its inside into the second atmospheric pressure different from the first atmospheric pressure, and a pressure detecting part 30 for detecting a differential atmospheric pressure between the atmospheric pressure inside the inner casing 20 and the atmospheric pressure inside the outer casing 10. The pressure detecting part 30 generates an abnormality signal when detecting the differential atmospheric pressure different from the initial differential atmospheric pressure, and a control part 54 receives the abnormality signal to erase the information stored in an information storage part 52.
Tomoyasu Sakaguchi
Hiroki Naito
Next Patent: ENGINEERING APPARATUS AND ENGINEERING METHOD